 /*******************************************************************************
  * Copyright (c) 2007 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/epl-v10.html
  *
  * Contributors:
  * IBM Corporation - initial API and implementation
  *******************************************************************************/
 package org.eclipse.ui.internal.console;

 import org.eclipse.jface.text.BadPositionCategoryException;
 import org.eclipse.jface.text.DefaultPositionUpdater;
 import org.eclipse.ui.internal.console.ConsoleHyperlinkPosition;

 /**
  * When any region of a hyperlink is replaced, the hyperlink needs to be deleted.
  *
  * @since 3.3
  */
 public class HyperlinkUpdater extends DefaultPositionUpdater {

     /**
      * @param category
      */
     public HyperlinkUpdater() {
         super(ConsoleHyperlinkPosition.HYPER_LINK_CATEGORY);
     }
     /**
      * When any region of a hyperlink is replaced, the hyperlink needs to be deleted.
      *
      * @return <code>true</code> if position has NOT been deleted
      */
     protected boolean notDeleted() {

         int positionEnd = fPosition.offset + fPosition.length - 1;
         int editEnd = fOffset + fLength - 1;
         if ((fOffset <= fPosition.offset && (editEnd > fPosition.offset)) ||
             (fOffset < positionEnd && (editEnd > positionEnd)) ||
             (fOffset >= fPosition.offset && fOffset <= positionEnd) ||
             (editEnd >= fPosition.offset && editEnd <= positionEnd)) {

             fPosition.delete();

             try {
                 fDocument.removePosition(ConsoleHyperlinkPosition.HYPER_LINK_CATEGORY, fPosition);
             } catch (BadPositionCategoryException x) {
             }

             return false;
         }

         return true;
     }
 }

